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restate modularity lifting theorem
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kbuzzard committed Apr 30, 2024
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7 changes: 4 additions & 3 deletions blueprint/src/chapter/ch04overview.tex
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Expand Up @@ -63,8 +63,9 @@ \section{A modularity lifting theorem}
that the functor representing $S$-good lifts of $\rhobar$ is representable.

\begin{theorem}\label{modularity_lifting_theorem}
If $\rhobar$ is modular of level $\Gamma_1(S)$ then any $S$-good $\ell$-adic lift
$\rho:G_F\to\GL_2(\calO)$ is also modular of level $\Gamma_1(S)$.
If $\rhobar$ is modular of level $\Gamma_1(S)$ and $\rho:G_F\to\GL_2(\calO)$ is
an $S$-good lift of $\rhobar$ to $\calO$, the integers of a finite extension of $\Q_\ell$,
then $\rho$ is also modular of level $\Gamma_1(S)$.
\end{theorem}

Right now we are very far from even stating this theorem in Lean.
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One can now go on to deduce that the 3-adic representation must be reducible, which
contradicts the irreducibility of $\rho$.

We apologise for the sketchiness of what is here, however at the time of writing it is so far from what we are even able to \emph{state} in Lean that there seems to be little point in fleshing out the argument further. As this document grows, we will add a far more detailed discussion of what is going on here.
We apologise for the sketchiness of what is here, however at the time of writing it is so far from what we are even able to \emph{state} in Lean that there seems to be little point right now in fleshing out the argument further. As this document grows, we will add a far more detailed discussion of what is going on here. Note in particular that stating the modularity lifting theorem in Lean is the first target.



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